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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9af9a2b92aa49ac3d9881a11c58d18291b997632e5f129fd09cb0cb68002799' 
  AND token = 'FW7gsPs6MKK9nRsS7c9d9RoYu6zupt52Fv7stz7dO1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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