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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7ab0ad1b9d25f04ebbd9dd241078e603c09b6648f11b4ac32f201926192458' 
  AND token = 'bsh67lFOzA52GKcqqqRSsLvN34XiyvS77Ff4o6pHzog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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