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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d13463389d17a0f0b154cb00a771264e649f09a22165ee2661ec9335c92f44' 
  AND token = 'UZmCJPQJAud6GXPWaXmtRjeYKiRH7Og0up6XxcKfWzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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