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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b664dde9bfa8c4008982b300e5e88dc4c5d7e1b5a5588f0a968c696c76618735' 
  AND token = 'Gqs9ZasYVrHeH5Ij69tRwKvsjGwtxOaHaYlpKc2+5VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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