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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a8f8114a187127315f244f83755b3e6a8f3539094fd6fb535b2146bf7fa5ab' 
  AND token = 'nAw+B4WK3Z0v3HEbeIOTWburaVifM1qKW4rgxBkKSkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}