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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17174c4c3f18e274a3bc98f6a945e52c1cbde0c848ba203ad3d7885e9ce51e63' 
  AND token = 'fWyES7uPIowepRk8ydBkjQTXlLf85Cq3WtC6l1qDkbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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