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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f57a8027619a2ee5498d0d7203dcb53606862f613d5d61c11be5cd566bfdcc3' 
  AND token = '8LopQAC+oTyNRCti5lfs7ZcqorX5mYpybZXZqEI3Fc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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