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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbae5cc89894f369efcb56d5d7981d9e92f664cc2896b1534d37cf6dc48bc17e' 
  AND token = 'JSu5xKU7MaVtcpLFBToo22AcKgjNzjbGl8T6oW3E+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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