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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d727602fea62a88f183b490ace43dce8f7e5e2070a4e89c228662b3df8ab4cf' 
  AND token = '82BQUPfaxiutwNK2feEnE70jvECYeh+qUvz0mL4PZuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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