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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4429490fea190249fd0a58f5b2f9f7afcb648b818e886e5cd2441f59201ef4' 
  AND token = 'f7f5Ob82v3IhblChTB+bzFL92d9WDo7iMFEAD9o7YA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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