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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd49ddd9a2adf2adc9ab495ccc701e370f13e1f4e9abd9906dee04c9fffee9' 
  AND token = 'z9/bpr4MrGM0tqU3ArFk1CAVKjVExPMuwCIwm2JhgRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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