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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d9879c95e04e7eda50ace7f15dd6cb644096850d31fc3b3dd9bbbb049c3149' 
  AND token = '07ZCXIndRjeAR5l/nOWJ0/6Tlj/UU+Rq38dE7r2oJWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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