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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9827312c739769ee75b1908665c75a01dbf52eb1ec9a454ae75543b4073e1a08' 
  AND token = 'LOdTs9utj7Bj1a4/kopGAdQCskLdXcoQpbuv2fYPbbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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