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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640e670b12771a1f192b96940b97bd4fc58497c2286b8ea85be1ff6f196e975d' 
  AND token = '41lRkonXIKnL+s6KjSLURlyGwMm9Fgy/uRE9iQ91n4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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