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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c1d07e163126112633ea7991a09a017d1207afdb3b8b58a766135a579f6707' 
  AND token = 'ea9cQCqBrgXARayhabn9Sf6MWTpcQsM9kh2zlVe9c/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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