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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65dea55a6126f2c91b414f7486d88ec3934764fcb851fb4ac6e7ef2ed8923e' 
  AND token = 'RMouPnBwG+wyYdawkvI3+j1SDERdywbTv7aFAtUfObo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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