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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dd2fdccd5ed4b4a360a0919e62548e6bbad4f8bdab4c604d47ca67618f749c' 
  AND token = 'XbpJ8W6G1dOiVtILTuw5dTz+HqxRLVkndiBxCMqXlzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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