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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476415c7d754126bb53e74b748d834d9e37cf85dfc492e83256bdcf3aadd631a' 
  AND token = 'ZWhcGwwxELQglIAOnj2CVOLb/sH5asAw8pxF6QTro8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00158

JSON explain

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