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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6af67d87107fbeee7a291985e23f9310c52588c05fa5afb773bc330349302eb' 
  AND token = 'NO+ibdm2fM8MXNCclPjrI6wPpgCm9Yt2P3bdOUZF238=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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