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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e0f333290164c51e1f08cff46281276440766cf2d83538938d3878c4a2846e' 
  AND token = 'OU3aHRUMb0ZlTUNjdTwLyxVp5X/GmS/BSkDA1RKVECo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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