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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a66518eabdbde2249eb298d194a383698fa03d5e673388dc1e6c56e9d7a10d8' 
  AND token = 'qyx7BGTah2ArX5m59I+mzDSY4bEPdzrEqsNxVHjuPFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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