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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbd9fb2ca8e8a67fb70d6089f9343f676e9559d127846fb8938e54695540f1e' 
  AND token = 'wtA79OPAjsRN1mlOpViUCefzloFRN/aPj8VkdNYZRkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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