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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87a1d67ff7ddcf3be7ed1d7790a3e1174f8e964e31d86d8c63269c0533a2f79' 
  AND token = 'dym6pw73uLvwAy2TBLwmSdbkpOXvKUELAUeNnsRxrzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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