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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0a9469e2f191b3ea566604e7ba71d8ad81978d46cbfbbf6262248874a77568' 
  AND token = '5O65zvBB5P8FDpPTwUpt7a50r1KpWOha/3dJ0jzjvOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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