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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc06a8605ec1e57b70b45451669a044d3914283201e43601bd0edc6afac11b1' 
  AND token = 'vw2Byw9kdRiAWgC1DUfLIIXO4DvpalH/My0m809RsvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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