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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd0f56023e52640ae1f4ef2c64bcf27d625d722e974ad04216a880da38c2f48' 
  AND token = '7D7+AVObQ7RVsVxBMRLflzqXZ3raSftmBHxcIF9UKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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