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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca35cee01dc731f10d5a36fb70c96e4a45b889b869e45047beaf19b96725b47b' 
  AND token = 'pDtrHWx7a3qggY6oJJnArbii5VFUBT7/XwzU+0gVkaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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