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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2efa092090517067eb81f6e3676dca29de9c84e7ec2ae63bd30bd42ecaa432e' 
  AND token = 'BXZ0IJDHnQ+1n+bqqHPDG5nCdmd2twsQUosSZoP5rPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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