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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97d4722d4c1ccda6afde1dcb490775c74230b0899577d5871ea29a61d875559' 
  AND token = 'r3sgENmMp95XdoN4SSaCOhTdTs9KuftZRJdh0AdwuWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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