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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2763e4482d63fab23a2bf14ff8e7af691ddbcfcf7ae3f32a1f5bfe507ab3cd7c' 
  AND token = '2Iar/YjV1nmHuM4CtcdyTgGQ4S1e9AD+gR1mpy+jX4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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