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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b83ef053a6f6e98003cc12cb52c7edcb7007061672f8a202fffe7f1ad85bc33' 
  AND token = 'qS4ZUrQ96NrPvw2PeQo3Frc+onrdSPqNCglOTCsRi8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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