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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdb3f0da69e0de224614ea8f83f50ef5befc8d3a574f99f2acec5e3a9f02f60' 
  AND token = '4edi8Q7h/NagiDf5m6VXiMngUnI/pZ3YOikr6UeGzOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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