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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10c76b1743ed67820013ed38105d069bee5250e7699ba9fd8211b9969dce0d1' 
  AND token = 'gSn+cc3k1FJWV/TBRc83f83hgJiwJL+jgPq0lmrXQQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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