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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26be88c5f28de3aaae6c18568d3bf5cee34c05e4b65e5ff7d879f78a25b9dbce' 
  AND token = 'yxQQ4Th4BoYHHL62Z6skTMcY9nl3Sicap6iUep0hi6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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