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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accc0c3db6052f5ba02caa6a6937118f949c4536178c93c109f78e30f9f41e83' 
  AND token = 'loZQ0AFMRG1E4eDaLQ3E6lu/z+3lJiwTeViSgN8bii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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