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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794accfedb997951bbd3e0b6b0de0683c27edfc301a25cad4eae335a038f95d7' 
  AND token = 'rggQjEmwRLq2VtOXmz3LDUnJ5Laba+keCMBGNMlkRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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