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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36f05a41355feb1e1d4114cddc33a5e8682c5eda58b8b3e01ed8392244182ca' 
  AND token = 'eGaPLfHguFWS12+t3GHwS5Oi8Q0jCgCfMXhPASL0llk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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