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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3141b24ab9b1a677b73c742829f9c3f343e6ddb84a03c5b977690f548d501d27' 
  AND token = 'eyJ88bHeTxZYMVtu1cJDBeLiHhiskZCKyMi+CDsFC2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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