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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30829d19af2b0bdbef1c4298c75396c6ce9b6888ccce538f5fdeefca1ee947e' 
  AND token = 'P9Lv7N4cPumvjx0wm4gUeUev7wkjnBGDHGsfP4UQwao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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