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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7df6296f8f29fa485e02bdf591fa613787958fbbd0e887466cc92922f4b946' 
  AND token = 'ntX5OFpsR2goz0YGR59oRUb2K9p3reAMQ+u6LB6982M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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