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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509370fdcec10078d5d672d31387df03ec7efc3ccd3cf4a1540e4b8d26a2bb40' 
  AND token = 'ieEVtEmUJF6aD4IyDS42WNoHOCeYDzCvt0tyMPH5qrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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