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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c68203b419337a997d8e75aaf125175a95f4b98798808811b1818d6d9645ce5' 
  AND token = 'F+aziaM/387vMVwwR37H6gnDOqWALqs1lZpH9l6va0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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