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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25cbee1f3a34230d9f4b362922a26373055d6a7d844636185a3ad8c1deb794e' 
  AND token = 'KXe2+F1Cs8XwFU4CI8Ph6VVDbiznxlPIPABYLymbC18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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