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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165aa717a2ea2a1cf80e1c823e165c748463656bbef804d4f02113e4eb413660' 
  AND token = 'f8YkPA6BAg6QpGKlD/Uyn7ri2wAlLFdRRnDqzU/x/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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