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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcec56e3b56e4420fbdaf39b22ae6597c6b1cc2e6f37f8dca70d927784e6c7b8' 
  AND token = 'mOKtk8z1Pi4y9lnEAefeUP8dO0/u83ekPa1dTKGPfig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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