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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be055190d8091fe009143ff7e44528fb5a3b9c7b94deed22800bdd080f0196a' 
  AND token = 'DiBJVUnGV5PeMmb+jgx66MFxP5tuTV1kuzRn5xF5F1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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