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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a316bf50a87ef0c7a2160b0ae102c934a67a732ff6a652bc9604efd6611aeda' 
  AND token = 'Z/gkclru7E5s6utg6PBEo9bG3jk7uGxstLU8lAhwD1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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