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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f1721b51d527369abda2908118f65e92803e73cb87e4e3ea9fdcdab85b082f' 
  AND token = 'vdTU2A4DzW1voBqMdLdhqjVHNypFn5UlkhUaULs2HyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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