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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6b5e6877b08af552d5287eb264e95a7cf07f42b0e8eb4859552d8662066970' 
  AND token = '88i/3JlKLtJIHffrO/slsV3aHALdj1T/fJNLQ3LtkPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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