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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6390eb2ca7f06250c41463668a146f132a5b20f147f6e82512b3af9306b4a108' 
  AND token = 'IWK/voXsc5HOOPmqhREimillfCP1t4eGuh3bvbalpkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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