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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb57a08d9f7e049763adbbe95163855a0d61a9372a6ae0b8a9d3a57821787c7' 
  AND token = 'z/63E0+ujIM0Kvob20ajlcQsw93NAizAftvzfUzrTBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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