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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd651aa8c949470858f2423f2b27f02313f79bf558c6655366083e3e9a031d3fc' 
  AND token = 'XSJqWn2KfkM89ZWGjgK0a0N5wInZh5iMFVUWPoaJpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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