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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb732bef1b0b8925aa3c638a4a0b3a0f08e2b3efe26b9303a6a5d5976c8433a' 
  AND token = 'yrp7QCsDM7oR/EfKz6DAkVF87HQhUmsLiNCTRSggWx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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