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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a187b6f6af3a5b43443c65d3cc0e0ea659fe17d3fe651e9ca85be22da1f2eaa' 
  AND token = 'SWDxmWrdgr0In/TytcL/USZPUnbax/4VWm6+sx9om1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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