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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28da13366bc9b0fff2883205663a8035ff48b9545a0062c33bd55a6110e488a0' 
  AND token = 'GvE03Bpm/CdgwyXgaJlKg0paw4bxWaq3v3AaNX4GURA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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