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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4950f9ff55c4ab0b1996e4f2ad92e1dd9780537388931f0af486b4122410df52' 
  AND token = '/NwrnZWveCo971DOXiUu7/8Lb+cLxcjbh7DujGcyN5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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