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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a95ce84a0dbf8de6dc114b6877b3534f0e59fe326d7556adc655f355f5b1a1' 
  AND token = 'tjt0+KOZyoiegmkSfZdRTrt654DnAbqYjo87UgZlLKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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