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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316d3fcc4635bd6235aec5fda9a9e4592533721581da85ea6ff14988ad3bbbfd' 
  AND token = 'Gf9UKpy48PcK4uSJX0vta+r1X86napYtX9q01BjHU6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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