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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ce1750dcc25d70ffc55ff138e43ee3037a8fe1509be86b732dd6769dbf936a' 
  AND token = 'Wk9+0H4uYg6rcxOVcMwr/Apw0ZV5pQwQrGIF1t3llkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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