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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830fcc1b2c97a2e456622990ee63a9299f0683379f4f29b488f0de8bc2c7f901' 
  AND token = 'ftn32iLNjmLu7aDfDYA1svia+zU0BA6UxHRTEIJDhrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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