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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b788555af05e1a76a1d4d1caac357c62bcb92fcd147ea8d65c21c045579ac44b' 
  AND token = 'EqohH6m5m/fy07GZJb+l5EygJemhhxSQWe2gRC5sjC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00218

JSON explain

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