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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa179111a375ae54ee2ca5988f3667bf81c4a73a88c50f91424b461dd292c17' 
  AND token = '508X6Ytx7Ct+ibv/tq/pGyG9EPvX9O39N/LW+9OHigY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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